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for (int i = 0; i < dt.Columns.Count; i++)
{
dt.Columns[i].ColumnName = GridView1.Columns[i].ToString();
}
for (int i = 0; i < dt.Columns.Count; i++)
{
for (int j = 0; j < GridView1.Columns.Count; j++)
{
if (dt.Columns[i].ColumnName == GridView1.Columns[j].DataField)
{
dt.Columns[i].ColumnName = GridView1.Columns[i].ToString();
}
}
}
foreach (GridViewRow gr in GridView1.Rows)
{
string str = gr.Cells[4].Text;
}