Sample code to show how to connect EventStoreDB to various sinks and source data repositories.

ExcelConnector/ExcelConnector.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.1.32407.343
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExcelConnector", "ExcelConnector\ExcelConnector.csproj", "{F8DAEA72-C0E3-409B-8A73-155C547B289E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F8DAEA72-C0E3-409B-8A73-155C547B289E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F8DAEA72-C0E3-409B-8A73-155C547B289E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F8DAEA72-C0E3-409B-8A73-155C547B289E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F8DAEA72-C0E3-409B-8A73-155C547B289E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {687B64F7-A41E-485C-A361-F11B5718C0A5}
+	EndGlobalSection
+EndGlobal

ExcelConnector/ExcelConnector/EventStoreLoginControl.cs

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+namespace ExcelConnector {
+    using System;
+    using System.Windows.Forms;
+
+    public partial class EventStoreLoginControl : UserControl {
+        public EventStoreLoginControl() {
+            InitializeComponent();
+        }
+
+        private void btnConnect_Click(object sender, EventArgs e) {
+            if (string.IsNullOrWhiteSpace(txtUsername.Text) || string.IsNullOrWhiteSpace(txtPassword.Text)) {
+                MessageBox.Show("Please provide username and/or password.");
+                return;
+            }
+            if (string.IsNullOrWhiteSpace(txtConnString.Text)) {
+                MessageBox.Show("A connection string must be provided.");
+            }
+
+            Globals.ThisWorkbook.OpenConnection(txtUsername.Text, txtPassword.Text, txtConnString.Text);
+        }
+    }
+}

ExcelConnector/ExcelConnector/EventStoreLoginControl.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

ExcelConnector/ExcelConnector/ExcelColumnFacade.cs

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+namespace ExcelConnector {
+    using System.ComponentModel;
+
+    using Microsoft.Office.Interop.Excel;
+
+    internal class ExcelColumnFacade : INotifyPropertyChanged {
+        private string _name;
+        private string _displayName;
+        private bool _isVisible;
+        private Range _columnReference;
+
+        public string Name {
+            get => _name;
+            set {
+                _name = value;
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Name)));
+            }
+        }
+
+        public string DisplayName {
+            get => _displayName;
+            set {
+                _displayName = value;
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(DisplayName)));
+                UpdateHeader();
+            }
+        }
+
+        public bool IsVisible {
+            get => _isVisible;
+            set {
+                _isVisible = value;
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsVisible)));
+                UpdateVisibility();
+            }
+        }
+
+        public Range ColumnReference {
+            get => _columnReference;
+            set {
+                _columnReference = value;
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ColumnReference)));
+                UpdateVisibility();
+            }
+        }
+
+        private void UpdateHeader() {
+            if (ColumnReference == null) return;
+
+            ColumnReference.Cells[1].Value2 = DisplayName;
+        }
+
+        private void UpdateVisibility() {
+            if (ColumnReference == null) return;
+
+            ColumnReference.EntireColumn.Hidden = !IsVisible;
+        }
+        public event PropertyChangedEventHandler PropertyChanged;
+    }
+}