// Bind dropwdown in gridview


protected void GvTestGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataTable dtData= new DataTable();
dtData= GetData(); // Get your data to be binded to dropdown
DropDownList ddlFileData= (DropDownList)e.Row.FindControl("DdlFileData");
ddlFileData.Datasource = dtData;
ddlFileData.DataBind();
}
}

Read more: http://feeds.dzone.com/~r/dzone/snippets/~3/8kmY2oCEQr8/14477