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C# - Using var in Chart Control with values. Concatenates string with integers in var.

Hi everyone.
How to use var for the model below?
Thanks in advance, ocaccy

var ch1=this.chart1.ChartAreas[0];
	
	switch(x)
	{
	case 1:
		var chInt=7200D;
		ch1.AxisX.LabelStyle.Interval=chInt;
		ch1.AxisX.MajorGrid.Interval=chInt;
		ch1.AxisX.MajorTickMark.Interval=chInt;
		break;

	case 2:
		var chInt=14400D;	
		ch1.AxisX.LabelStyle.Interval=chInt;
		ch1.AxisX.MajorGrid.Interval=chInt;
		ch1.AxisX.MajorTickMark.Interval=chInt;
		break;

	case 3:
		var chInt=21600D;	
		ch1.AxisX.LabelStyle.Interval=chInt;
		ch1.AxisX.MajorGrid.Interval=chInt;
		ch1.AxisX.MajorTickMark.Interval=chInt;
		break;
	}

	
	var ch1=this.chart1.ChartAreas[0];
	int i_ch1Y=7200;

	switch(x)
	{
	case 1:
		i_chInt=x*i_ch1Y;
		var chInt=i_chInt+"D"; 
		// This is my idea, but I don't know how to concatenate
		// int value to String D to turn into 7200D.
		ch1.AxisX.LabelStyle.Interval=chInt;
		ch1.AxisX.MajorGrid.Interval=chInt;
		ch1.AxisX.MajorTickMark.Interval=chInt;
		break;

	case 2:
		i_chInt=x*i_ch1Y;
		var chInt=i_chInt+"D"; 
		ch1.AxisX.LabelStyle.Interval=chInt;
		ch1.AxisX.MajorGrid.Interval=chInt;
		ch1.AxisX.MajorTickMark.Interval=chInt;
		break;

	case 3:
		i_chInt=x*i_ch1Y;
		var chInt=i_chInt+"D";
		ch1.AxisX.LabelStyle.Interval=chInt;
		ch1.AxisX.MajorGrid.Interval=chInt;
		ch1.AxisX.MajorTickMark.Interval=chInt;
		break;
	}

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SOLUTION

Meir Rivkin

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ASKER CERTIFIED SOLUTION

Michael Fowler

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ocaccy

ASKER

ok.

int aa;
int xx=2;
int yy=7200;
aa=xx*yy;
var chInt=aa+"D"; // How to concatenate this ( aa+"D" ) to turn it ( 14400D ) ?

sample:
ch1.AxisX.LabelStyle.Interval=chInt; // chInt==14400D;

SOLUTION

Michael Fowler

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ocaccy

ASKER

Does not work, because it is expected to double.
chart1.ChartAreas[0].AxisX.LabelStyle.Interval=7200D;
chart1.ChartAreas[0].AxisX.MajorGrid.Interval=7200D;
chart1.ChartAreas[0].AxisX.MajorTickMark.Interval=7200D;

If use this:

var chInt = 7200D;
chart1.ChartAreas[0].AxisX.MajorTickMark.Interval=chInt;

works.

SOLUTION

Michael Fowler

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ocaccy

ASKER

Thank you.