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You can do it using the Text property of Column's header and Renderers.
Please, take a look at the sample below, it's based on this sample:
https://examples2.ext.net/#/GridPanel/ArrayGrid/Simple/
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!X.IsAjaxRequest)
{
this.Store1.DataSource = this.Data;
this.Store1.DataBind();
}
}
private object[] Data
{
get
{
return new object[]
{
new object[] { "3m Co", 71.72, 0.02, 0.03, "9/1 12:00am" },
new object[] { "Alcoa Inc", 29.01, 0.42, 1.47, "9/1 12:00am" },
new object[] { "Altria Group Inc", 83.81, 0.28, 0.34, "9/1 12:00am" },
new object[] { "American Express Company", 52.55, 0.01, 0.02, "9/1 12:00am" },
new object[] { "American International Group, Inc.", 64.13, 0.31, 0.49, "9/1 12:00am" },
new object[] { "AT&T Inc.", 31.61, -0.48, -1.54, "9/1 12:00am" },
new object[] { "Boeing Co.", 75.43, 0.53, 0.71, "9/1 12:00am" },
new object[] { "Caterpillar Inc.", 67.27, 0.92, 1.39, "9/1 12:00am" }
};
}
}
</script>
<!DOCTYPE html>
<html>
<head runat="server">
<title>Simple Array Grid - Ext.NET Examples</title>
<style>
.x-grid-row-over .x-grid-cell-inner {
font-weight : bold;
}
</style>
<script>
var template = '<span style="color:{0};">{1}</span>';
var change = function (value) {
return Ext.String.format(template, (value > 0) ? "green" : "red", value);
};
var pctChange = function (value) {
return Ext.String.format(template, (value > 0) ? "green" : "red", value + "%");
};
</script>
</head>
<body>
<ext:ResourceManager runat="server" />
<h1>Simple Array Grid</h1>
<ext:GridPanel
ID="GridPanel1"
runat="server"
Title="Array Grid"
Width="600"
Height="350">
<Store>
<ext:Store ID="Store1" runat="server">
<Model>
<ext:Model runat="server">
<Fields>
<ext:ModelField Name="company" />
<ext:ModelField Name="price" Type="Float" />
<ext:ModelField Name="change" Type="Float" />
<ext:ModelField Name="pctChange" Type="Float" />
<ext:ModelField Name="lastChange" Type="Date" DateFormat="M/d hh:mmtt" />
</Fields>
</ext:Model>
</Model>
</ext:Store>
</Store>
<ColumnModel>
<Columns>
<ext:Column runat="server" Text="Company" DataIndex="company" Flex="1" />
<ext:Column runat="server" Text="Price <br /><br /> Change <br /><br /> Percent Change" DataIndex="price">
<Renderer Handler="
return record.get('price') + '<br />' + change(record.get('change')) + '<br />' + pctChange(record.get('pctChange'));" />
</ext:Column>
<ext:DateColumn runat="server" Text="Last Updated" DataIndex="lastChange" />
</Columns>
</ColumnModel>
<SelectionModel>
<ext:RowSelectionModel runat="server" />
</SelectionModel>
</ext:GridPanel>
</body>
</html>
Also, to create multiple headers, you can use HeaderItems like in this sample:
https://examples2.ext.net/#/GridPane...ader/Overview/ or Grouped headers:
https://examples2.ext.net/#/GridPane...mnHeaderGroup/