Creating an ASP.net GridView board (without server connection) - asp.net

Question

I'm going to create a 4-column, 10-line gridview board. I want to make it using a loop. I do not know what to do with the cs code. I am a beginner and I am practicing as an example. Help please.
.aspx
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true"
AllowSorting="True"
AllowPaging="True" PageSize="10" onrowdatabound="GridView1_RowDataBound"
ondatabound="GridView1_DataBound" EmptyDataText="NO">
<EmptyDataTemplate>No Data</EmptyDataTemplate>
</asp:GridView>
.aspx.cs
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
{
e.Row.Cells[0].Text = "Complete";
}
}
protected void GridView1_DataBound(object sender, EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
GridViewRow row = GridView1.Rows[i];
var str = GridView1.DataKeys[row.RowIndex]["SomeColumnName"];
}

Answer 1

Quick Example:
.aspx code:
<asp:GridView ID="GridView1" runat="server"></asp:GridView>
.cs code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Create a datatable as a DataSource of your GridView
DataTable dt = new DataTable();
// Add columns
if (dt.Columns.Count == 0)
{
for (int i = 1; i <= 4; i++)
{
dt.Columns.Add("Column" + i);
}
}
// Add rows
for (int i = 1; i <= 10; i++)
{
dt.Rows.Add("Data" + i, "Data" + i, "Data" + i, "Data" + i);
}
// Bind datatable to gridview
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
Output: