Question

I want to check if my “many” column in datagridview is empty.

here my code

        for (int i = 0; i < (gridx.Rows.Count - 1); i++)
        {
            col = gridx.Rows[i].Cells["code"].Value.ToString();
            col4 = gridx.Rows[i].Cells["many"].Value.ToString();                
        }

        if (col4 == "")
        {
            MessageBox.Show("Many is empty");
            this.Focus();
            return;
        } 
        else
        {
          //my code in here
        }

but it don’t show error “many is empty”

please help me.. and thanks before

Answer 1

Since you are assigning the last cell value to col4 in your for loop, you may check it against null.

for (int i = 0; i < (gridx.Rows.Count - 1); i++)
        {
            col = gridx.Rows[i].Cells["code"].Value.ToString();
            if(gridxRows[i].Cells["many"].Value == null ||       
               gridxRows[i].Cells["many"].Value == string.Empty)
             {
                col4 = gridx.Rows[i].Cells["many"].Value.ToString();
             }
         }

Your current code will only check if the last row of the cell["many"] is empty. If you want make sure that all the columns is empty then you may try the following approach.

bool isColumnEmpty = true;
for (int i = 0; i < (gridx.Rows.Count - 1); i++)
        {
            col = gridx.Rows[i].Cells["code"].Value.ToString();
            if(gridxRows[i].Cells["many"].Value == null ||       
               gridxRows[i].Cells["many"].Value == string.Empty)
             {
                col4 = gridx.Rows[i].Cells["many"].Value.ToString();
                isColumnEmpty = false; // that means some thing is found against cell
             }
         }

now check if the isColumnEmpty flag got set;

if(isCoulmnEmpty)
{
            MessageBox.Show("Many is empty");
            this.Focus();
            return;
}