How to set Datatable cell which has more than one controls in asp.net?

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C#

ASP.NET

Gridview

DataTable

I'm working on asp.net web aplication. I'm creating a temporary DataTable for which I need to assign some values from GridView.

In GridView Some Columns have more than one controls. example, To display DateTime I'm using calendar to pick date and three dropdowns to display hh:mm:ss. so these values make one column. Now I want to use these values. For one Column RuleNumber its very simple. Please help me.

This is the code.

DropDownList localDropDownRuleNumber = (DropDownList)grvStudentDetails.Rows[rowIndex].Cells[1].FindControl("dropDownRuleNumber");
 TextBox localTextBoxStartDate = (TextBox)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("StartDateTime");
                    DropDownList localDropDownStartHour = (DropDownList)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("StartHourDropDown");
                    DropDownList localDropDownStartMinute = (DropDownList)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("StartMinute");
                    DropDownList localDropDownStartSec = (DropDownList)grvStudentDetails.Rows[rowIndex].Cells[2].FindControl("StartSS");

This is temporary datatable.

drCurrentRow = dtCurrentTable.NewRow();
                    drCurrentRow["RowNumber"] = i + 1;

this is how I'm assigning values.

dtCurrentTable.Rows[i - 1]["Col1"] = localDropDownRuleNumber.SelectedValue;
                    dtCurrentTable.Rows[i - 1]["Col2"] = localTextBoxStartDate.Text;