How to find a column index by database column name in grid view in C#

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hi,
I want to find a column Index by bind Database column name can anyone help me how to achieve this functionality

<asp:TemplateField HeaderText="Ref Doc#">
    <ItemTemplate>
        <%# Eval("poNo")%>
    </ItemTemplate>
    <ItemStyle CssClass="textAlignCenter noWrap" />
        <HeaderStyle CssClass="textAlignCenter noWrap" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Ref Date">
    <ItemTemplate>
        <%# Eval("poDate", "{0:dd-MMM-yyyy}")%>
    </ItemTemplate>
    <FooterTemplate>
        <asp:Label ID="lblSum" runat="server" Text="Total Amount:" Font-Bold="true"></asp:Label>
    </FooterTemplate>
    <ItemStyle CssClass="textAlignCenter noWrap" />
    <HeaderStyle CssClass="textAlignCenter noWrap" />
    <FooterStyle CssClass="textAlignLeft" />
</asp:TemplateField>

protected void grdOutstandingInvoice_RowDataBound(object sender, GridViewRowEventArgs e)
{

}

I want to find column index by Eval("poNo"), how we can achieve this. please help me.

thanks in Advance

What I have tried:

I tried hard coded that

grdOutstandingInvoice.Columns[7].Visible = false;

but as per requirement they added some more columns,
then I tried this

private int GetColumnIndexByName(GridView grid, string name)
    {
        foreach (DataControlField col in grid.Columns)
        {
            if (col.HeaderText.ToLower().Trim() == name.ToLower().Trim())
            {
                return grid.Columns.IndexOf(col);
            }
        }

        return -1;
    }

protected void grdOutstandingInvoice_RowDataBound(object sender, GridViewRowEventArgs e)
{
var index = GetColumnIndexByName(grid,name);
}

But earlier header name was Reference Doc now they changed it by Ref Doc# that's why i dont want to take risk for future, i want to find column index by my database column field that will never change

Posted 12-Jun-17 20:50pm

Member 10192073

Updated 12-Jun-17 23:42pm

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lekhasreekrishna@gmail.com · Answer 1 · 2017-06-12T23:42:00

protected void grdOutstandingInvoice_RowDataBound(object sender, GridViewRowEventArgs e)
{
var index = GetColumnIndexByName(grid,name);
}

Replace the above function with the following

protected void grdOutstandingInvoice_RowDataBound(object sender, GridViewRowEventArgs e)
{
var index = GetColumnIndexByName(grdOutstandingInvoice,poNo);
}

if it is not working, please try with the following function

<pre>static public int GetColumnIndexByDBName(GridView grdOutstandingInvoice, String poNo)
{
System.Web.UI.WebControls.BoundField DataColumn;

for (int Index = 0; Index < grdOutstandingInvoice.Columns.Count; Index++)
{
DataColumn = grdOutstandingInvoice.Columns[Index] as System.Web.UI.WebControls.BoundField;

if (DataColumn != null)
{
if (DataColumn.DataField == poNo)
return Index;
}
}
return -1;

}