如果复选框已选中，则只应调用插入，即为True ...

 DataGridViewCheckBoxCell ch1 = new DataGridViewCheckBoxCell（）; 
 ch1 =（DataGridViewCheckBoxCell）DGv_Session.Rows [i] .Cells [1]; 
 if（ch1.Value！= null&& bool.Parse（ch1.Value.ToString（））== true）
 ... 

我个人会添加一个小帮手功能

  private   bool  IsTrue（DataGridViewCell cb）
 {
 DataGridViewCheckBoxCell tcb =（DataGridViewCheckBoxCell）cb; 
 bool  bRet =  false ; 
 if （tcb.Value！=  null &&  bool  .Parse（tcb.Value.ToString（））==  true ）
 bRet = 真跨度>; 
 return  bRet; 
}} 

这将使你的相当大的if语句更容易阅读...

 if（IsTrue（DGv_Session [1，i]）&& IsTrue（DGv_Session [2，i]）&& IsTrue（DGv_Session [3，i]）&& IsTrue（DGv_Session [4， I]））

validating checkbox which are not checked in the datagridview those record should not be save in the database.


Save code as follows;

for (int i = 0; i < DGv_Session.RowCount; i++)
           {
               try
               {
                   if (DGv_Session[1, i].Value != null && DGv_Session[1, i].Value != "" && DGv_Session[2, i].Value != null && DGv_Session[2, i].Value != "" && DGv_Session[3, i].Value != null && DGv_Session[3, i].Value != "" && DGv_Session[4, i].Value != null && DGv_Session[4, i].Value != "")
                   {
                       sql = "insert into Tb_Session_Structure ([Cmn_Minor_code],[Days],[Session1],[Session2],[Session3],[Session4])";

                       sql = sql + " values('" + cb_Course_Code.Text + "',
 '" + DGv_Session.Rows[i].Cells[0].Value.ToString() + "',
 " + (Convert.ToBoolean(DGv_Session[1, i].Value) == true).ToString() + ",
 " + (Convert.ToBoolean(DGv_Session[2, i].Value) == true).ToString() + ",
 " + (Convert.ToBoolean(DGv_Session[3, i].Value) == true).ToString() + ",
 " + (Convert.ToBoolean(DGv_Session[4, i].Value) == true).ToString() + ")";
                       GFun.Error = "";
                       GFun.InsertAccessData(sql);
                       if (GFun.Error.ToString() != "")
                       {
                           MessageBox.Show(GFun.Error.ToString(), "Error");
                           return;
                       }
                       GFun.OleDbCon.Close();
                   }
               }
               catch (Exception ex)
               {
                   MessageBox.Show(ex.ToString(), "Error");
                   return;
               }
           }

I am validating check box which are not checked in the datagridview that value not to be saved in the database.

Days 1 2
1 checkboxunchecked checkboxunchecked
2 checkboxchecked checkboxchecked

after enters the above records into the database and click the save button.

In the database records show as follows;

Days 1 2
1 checkboxunchecked checkboxunchecked
2 checkboxchecked checkboxchecked

but i want which checkbox which which are not checked in the datagridview do not be saved in the database.

I want the final output as follows after made entries and click the save button records in the database as follows;


Final ouput as follows;
Days 1 2
2 checkboxchecked checkboxchecked

You should only call the insert if the checkbox is checked i.e. is True ...

DataGridViewCheckBoxCell ch1 = new DataGridViewCheckBoxCell();
ch1 = (DataGridViewCheckBoxCell)DGv_Session.Rows[i].Cells[1];
                if(ch1.Value != null && bool.Parse(ch1.Value.ToString()) == true)
...

Personally I would add a little helper function

private bool IsTrue(DataGridViewCell cb)
{
    DataGridViewCheckBoxCell tcb = (DataGridViewCheckBoxCell)cb;
    bool bRet = false;
    if (tcb.Value != null && bool.Parse(tcb.Value.ToString()) == true)
        bRet = true;
    return bRet;
}}

which would make your rather large if statement easier to read...

if (IsTrue(DGv_Session[1, i]) && IsTrue(DGv_Session[2, i]) && IsTrue(DGv_Session[3, i]) && IsTrue(DGv_Session[4, i]))