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and val(date1) like '%" + dtpStartDate.Value.ToShortDateString() + "%'

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DataRow[] drExist = dtGroupSub.Select("GS_LId='" + txtCurrentLayId.Text + "' and format(GS_StartDate,'yyyy-mm-dd')="+ dtpStartDate.Value.ToShortDateString()+"");

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DataRow[] drExist = dtGroupSub.Select("GS_LId='" + txtCurrentLayId.Text + "' and convert(varchar(10),GS_StartDate,23)='"+ dtpStartDate.Value.ToShortDateString()+"'");

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