adding new row in grid

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ASP.NET

if (e.CommandName == "AddLBtn")
{
                objdc.MemberName1 = ((TextBox)AuditReportDetailsGv.FooterRow.FindControl("MemberNameFTxt")).Text;
                objdc.MemberId = ((TextBox)AuditReportDetailsGv.FooterRow.FindControl("MemberIdFtxt")).Text;
}

i am taking value like this but i am getting null value when i am inserting the values.
actually my need is i have to insert the new row in the grid and it should reflect in the grid .

can anyone help me?